Problems
During regular usage, small pieces of wire can become stuck inside the 110 block contacts; this renders that given pair unreliable or unusable, until the pieces are removed. A tool known as a spudger can be used to remove excess wire pieces. The wire hook which comes on many punch down tools can also be used to remove wire pieces.
A new wire inserted over an existing wire remnant will be unable to make reliable contact with the 110 block, which was designed to hold only a single wire per contact.
For testing. it is more difficult to reliably connect to a working circuit on a 110 block than on older style blocks. The circuit must be broken, or insulation displacing contacts may be used on jumper wires. Repeated use of insulation displacing contacts may lead to a difficult to locate broken or intermittent jumper wire.
Read more about this topic: 110 Block
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